Tobbaco/PGA extract melted dropper bulb

[emus]

I've been storing PGA in bottles with black dropper bulbs for over one year.
All my dropper bulbs are from same vendor.
One dropper bulb containing a tobacco PGA extract melted.
Bulb stored at room temperature.
Other droppers are fine.
Melted dropper was in a zip lock and may have been exposed to another contaminant.
I know some rubbers are not compatible with alcohol.
Not sure what type black rubber used on my dropper bottles.

 

[Crimmy]

I've been storing PGA in bottles with black dropper bulbs for over one year.
All my dropper bulbs are from same vendor.
One dropper bulb containing a tobacco PGA extract melted.
Bulb stored at room temperature.
Other droppers are fine.
Melted dropper was in a zip lock and may have been exposed to another contaminant.
I know some rubbers are not compatible with alcohol.
Not sure what type black rubber used on my dropper bottles.

Nicotine is recommended around rubber, unless its silicone I ordered some pure nicotine and it came in a plastic bottle with a rubber dropper and it lasted about a week. The bulb collapsed on it right away. So now I will not use rubber. I would throw it away if the nicotine has become darker.